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WO2013136841A1 - Four de fusion de métaux, et procédé de fusion de métaux - Google Patents

Four de fusion de métaux, et procédé de fusion de métaux Download PDF

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Publication number
WO2013136841A1
WO2013136841A1 PCT/JP2013/051078 JP2013051078W WO2013136841A1 WO 2013136841 A1 WO2013136841 A1 WO 2013136841A1 JP 2013051078 W JP2013051078 W JP 2013051078W WO 2013136841 A1 WO2013136841 A1 WO 2013136841A1
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WIPO (PCT)
Prior art keywords
furnace body
storage chamber
material storage
exhaust
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/051078
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English (en)
Japanese (ja)
Inventor
裕介 脇田
一文 丹羽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Takaoka Co Ltd
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Aisin Takaoka Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisin Takaoka Co Ltd filed Critical Aisin Takaoka Co Ltd
Publication of WO2013136841A1 publication Critical patent/WO2013136841A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners

Definitions

  • the present invention is based on a Japanese patent application: Japanese Patent Application No. 2012-060016 (filed on March 16, 2012), and the entire contents of the application are incorporated herein by reference.
  • the present invention relates to a metal melting furnace for melting a metal material to create a molten metal, and a metal melting method using the same.
  • a metal melting furnace that melts a metal material put into a furnace body with a hot gas obtained by burning liquefied natural gas or the like.
  • fuel such as liquefied natural gas
  • high-temperature exhaust gas containing carbon monoxide is generated.
  • the hot exhaust gas rises in the furnace body, is introduced into an exhaust port provided in the upper part of the furnace body, and is discharged outside the furnace body.
  • the exhaust gas is mixed with outside air around the exhaust port, the contained carbon monoxide may ignite and burn.
  • carbon monoxide burns around the exhaust port the pressure in the furnace body becomes negative, and the air around the exhaust port is pulled into the furnace body and air is sucked into the furnace from the outlet.
  • Patent Document 1 discloses a vertical furnace body having a material inlet that is opened and closed by a furnace lid at the top, and a bottom portion in the furnace body.
  • a metal melting furnace having a plurality of oxyfuel combustion burners arranged in the vicinity is disclosed.
  • the furnace body of the metal melting furnace of Patent Document 1 is provided with a non-oxidizing substance introduction section for introducing a non-oxidizing gas having a specific gravity larger than air into the furnace body at a position higher than the combustion burner.
  • a technique is disclosed in which the non-oxidized gas that has been used functions as a gas barrier layer to suppress the entry of outside air when the material is charged.
  • the non-oxidizing gas introduction technique of Patent Document 1 does not assume the entry of outside air except when the furnace lid is opened, and it is difficult to completely prevent the entry of outside air due to suction from the hot water outlet. Met. For this reason, there is still a possibility that the metal material is oxidized by the introduction of outside air containing a large amount of oxygen. The oxidation of the metal material contributes to the generation of slag, which lowers the quality and quantity of the molten metal and ultimately leads to material loss. For this reason, there is a need for technology that not only prevents the entry of outside air when materials are added, but also promotes the metal melting process as efficiently as possible to further reduce material loss (generally referred to as “oxidation loss”) due to oxidation of metal materials. It was done.
  • a metal melting furnace is desired in which a decrease in furnace pressure and a decrease in furnace thermal efficiency are prevented. It is also desirable to provide a metal melting furnace capable of avoiding metal oxidation by preventing outside air from entering the furnace. In addition, there is a demand for a metal melting method in which the furnace has high thermal efficiency, the pressure in the furnace is stable, and metal oxidation can be avoided as much as possible.
  • a metal melting furnace includes a vertical furnace body having a blower opening at the top and a tapping opening at the bottom, and a material storage chamber that is adjacent to the top of the furnace body and stores metal materials.
  • the material input door is provided at the boundary between the furnace body and the material storage chamber so as to be openable and closable so that the furnace body and the material storage chamber communicate with each other and the metal material is input from the material storage chamber into the furnace body.
  • a combustion burner provided near the bottom of the furnace body to heat and melt the metal material charged into the furnace body, exhaust gas containing carbon monoxide generated by combustion of the combustion burner, and oxygen supplied from the blower port
  • an ignition burner provided at the top of the furnace body and supplying the reburned exhaust gas to the material storage chamber to preheat the stored metal material.
  • One end is open to the furnace body and the other end is material Comprises a heat discharge passage which opens into the tube chamber, the.
  • the carbon monoxide contained in the exhaust gas generated by the combustion in the combustion burner is ignited at the upper part of the furnace body by the ignition burner, and reacts with oxygen contained in the air supplied from the blower port. It becomes carbon dioxide by complete combustion. Since carbon monoxide in the exhaust gas is removed by this reaction, the exhaust gas is discharged from the exhaust port at a high temperature and does not burn even when mixed with air.
  • exhaust gas from which carbon monoxide has been removed is supplied to the material storage chamber by a heat exhaust passage having one end opened in the furnace body and the other end opened in the material storage chamber.
  • the stored metal material is preheated. By introducing the preheated metal material into the furnace body, the metal material is efficiently dissolved.
  • the first exhaust duct including the first exhaust damper is connected to the upper portion of the furnace body, and the second exhaust duct including the second exhaust damper is provided. It is preferable to be connected to the upper part of the material storage chamber.
  • the first exhaust damper is closed and the second exhaust damper is opened.
  • the first exhaust damper is opened and the second exhaust damper is closed.
  • the exhaust gas exhaust path from the furnace body is controlled, and when the metal material is stored in the material storage room and when the metal material is charged And an exhaust gas flow suitable for each can be selected.
  • the exhaust gas can be introduced into the material storage chamber and discharged from the second exhaust duct, so that the metal material is efficiently preheated.
  • the exhaust gas can be discharged from the first exhaust duct at the top of the furnace body, so that the pressure in the furnace is controlled to be constant.
  • a metal melting method includes a vertical furnace body having a first exhaust duct having a first exhaust damper and an air blowing port at an upper portion and a hot water outlet at a bottom portion, and adjacent to the upper portion of the furnace body. And is provided at the boundary between the material storage chamber provided with the second exhaust duct having the second exhaust damper and the furnace body and the material storage chamber, and can be opened and closed.
  • an ignition burner provided at the top of the furnace body and the exhaust gas after the re-combustion are used as materials Metal materials supplied and stored in the storage room.
  • one end is a metal dissolution method and the other end is open and the heat discharge passage is opened to the material storage chamber, using a metal melting furnace having a furnace body.
  • the first exhaust damper is closed and the second exhaust damper is opened, thereby allowing the The reburned exhaust gas is supplied to the material storage room.
  • the first exhaust damper is opened and the second exhaust damper is closed, so that the recombusted exhaust gas is removed from the first exhaust damper.
  • the pressure inside the furnace is controlled by introducing it into the exhaust duct side.
  • the melting furnace according to the third aspect can include the following elements: A vertical furnace body having an air outlet at the top and a tapping outlet at the bottom; A combustion burner provided near the bottom of the furnace body for heating and melting the metal material charged into the furnace body; An ignition burner provided at an upper portion of the furnace body so that exhaust gas containing carbon monoxide generated by combustion of the combustion burner and oxygen supplied from the blower port are recombusted at the upper portion of the furnace body.
  • the melting furnace of the third aspect can include one or more of the following elements: A material storage chamber for storing a metal material charged into the furnace body; A first exhaust passage connected to the furnace body and capable of exhausting the exhaust gas out of the furnace body; A second exhaust passage connected to the furnace body through the material storage chamber and capable of exhausting the exhaust gas out of the furnace body; A heat exhaust passage that bypasses between the furnace body and the material storage chamber; The air outlet, the ignition burner, and the heat exhaust passage are arranged close to each other; The material storage chamber is openable and closable with respect to the furnace body and outside air.
  • the dissolution method of the fourth aspect can include the following elements: A process of carrying a metal material into a material storage chamber; Supplying exhaust gas in the furnace to the metal material in the material storage chamber; Introducing the metal material in the material storage chamber into the furnace; Discharging the exhaust gas in the furnace without passing through the material storage chamber when the metal material is charged;
  • the dissolution method of the fourth aspect can include one or more of the following elements: Reburning the exhaust gas in the furnace body;
  • the exhaust gas supplied into the material storage chamber includes the re-combusted secondary exhaust gas;
  • the material storage chamber is closed to the outside air when the metal material is charged.
  • the metal melting furnace and metal melting method of each viewpoint contribute to the following effects.
  • Carbon monoxide in the exhaust gas generated by the combustion in the combustion burner is ignited at the upper part of the furnace body by the ignition burner, and becomes carbon dioxide by performing a combustion reaction with oxygen supplied from the blower port. Since carbon monoxide in the exhaust gas is removed by this combustion reaction, the exhaust gas discharged from the exhaust port does not burn even when mixed with air. Since the combustion around the exhaust port does not occur, the inside of the furnace is always maintained at a positive pressure, and the possibility of outside air entering the furnace from both the exhaust port and the hot water outlet is avoided. As a result, the pressure in the furnace body is always stable and the thermal efficiency is kept constant.
  • the metal melting furnace and metal melting method from each viewpoint contribute to the following effects.
  • the exhaust gas supplied through the heat exhaust passage is used for preheating the metal material in the material storage chamber, so that the thermal efficiency of the furnace can be further improved.
  • the metal melting furnace and metal melting method from each viewpoint contribute to the following effects. By preventing intrusion of outside air into the furnace body, metal oxidation in the melting process is avoided as much as possible.
  • the metal material held in the material storage chamber is also prevented from being oxidized as much as possible. Avoidance of oxidation of the metal material leads to a decrease in slag discharge and contributes to an improvement in the quality and yield of the molten metal. Since the alloy addition cost in the subsequent process is suppressed by improving the quality and yield of the molten metal, it is possible to obtain a high-quality molten metal at a lower cost.
  • Metal melting furnaces from various viewpoints contribute to the following effects.
  • the quality and yield of the molten metal can be improved by simply installing an ignition burner, a heat exhaust passage and a second exhaust duct in the existing furnace body.
  • FIG. 2 is a horizontal sectional view of the metal melting furnace shown in FIG. 1 along the line AA.
  • FIG. 1 the vertical direction sectional view of the metal melting furnace of this embodiment is shown.
  • the metal melting furnace of the present embodiment includes a vertical furnace body 10, and the vertical furnace body 10 has a bottomed and covered cylindrical shape standing upright along the vertical direction. Yes.
  • a hot water outlet 11 is provided at the bottom of the furnace body 10, and a material inlet 18 is provided at the upper side wall of the furnace body 10.
  • An air blowing port 12 is provided at a position closer to the material charging port 18 than the center of the top of the furnace body 10.
  • a blower passage 31 including a blower fan 32 is connected to the blower opening 12 and air is supplied in a state where the supply amount is controlled.
  • a melting chamber 13 for melting an input M made of a metal material is defined in the furnace body 10.
  • the hearth surface 15 corresponding to the bottom surface of the melting chamber 13 is formed as an inclined surface that descends toward the hot water outlet 11, and the hot water outlet 11 is located at the lowest place of the melting chamber 13.
  • a material storage chamber 21 for storing a metal material is provided adjacent to the furnace body 10 outside the material input port 18 of the furnace body 10.
  • the material storage chamber 21 includes a carry-in port 27 provided with a carry-in door 25 at the top, and a carry-out port 28 at a position corresponding to the material input port 18 of the furnace body 10.
  • the floor surface 22 of the material storage chamber 21 descends linearly from the carry-in port 27 toward the carry-out port 28, and the carry-out port 28 is located at the lowest position of the material storage chamber 21.
  • a material input door 23 is disposed at a location where the material outlet 28 on the material storage chamber 21 side and the material input port 18 on the furnace body 10 side are connected (that is, the boundary between the material storage chamber 21 and the furnace body 10). Yes.
  • a hinge-type support structure 24 that rotates the material charging door 23 between an open position (a position indicated by a solid line) and a closed position (a position indicated by a two-dot chain line) is provided above the material charging door 23.
  • the material input door 23 is supported by the support structure 24 so as to be opened and closed.
  • the material input door 23 is normally in a closed position and functions as a bottom plate of the material storage chamber, and holds the metal material stacked in the material storage chamber 21.
  • the material charging door 23 rotates to the furnace body 10 side and moves to the open position, the furnace body 10 and the material storage chamber 21 communicate with each other, and the held metal material is charged into the furnace body 10. To do.
  • the material storage chamber 21 can be opened and closed with respect to the furnace body 10 and the outside air.
  • a plurality of oxygen combustion burners 16 for burning fuel gas such as liquefied natural gas or fuel liquid using oxygen as a combustion aid.
  • a group of burners composed of eleven oxyfuel combustion burners 16 is arranged in the upper part of the passage from the melting chamber 13 of the furnace body 10 toward the hot water outlet 11.
  • the combustion flames ejected from the respective oxygen combustion burners 16 form a hollow flame f (indicated by a two-dot chain line) having a hollow shape very similar to a cylinder.
  • the oxyfuel burner 16 uses high-concentration oxygen gas (oxygen concentration of 90% or more) as an auxiliary combustion gas, the temperature of the hollow flame f reaches a high temperature of 1800 ° C. to 3300 ° C. Therefore, even when the input M is a refractory metal, the input M can be efficiently and rapidly dissolved.
  • high-concentration oxygen gas oxygen concentration of 90% or more
  • An ignition burner 17 (one in this example) that is an oxyfuel burner having the same specifications as the oxyfuel burner 16 is provided at the top of the furnace body 10.
  • the ignition burner 17 is disposed on the upper portion of the furnace body 10, and in particular, is disposed above the plurality of oxygen combustion burners 16.
  • the ignition burner 17 is disposed in the vicinity of an exhaust gas inlet 19 of a heat exhaust passage 26 described later.
  • the ignition burner 17 is disposed in the vicinity of the air blowing port 12, and again transmits the exhaust gas containing carbon monoxide generated by the combustion of the oxyfuel combustion burner 16 and the oxygen contained in the air supplied from the air blowing port 12. Burn.
  • the exhaust gas ignited by the ignition burner 17 and recombusted is also referred to as secondary exhaust gas.
  • the carbon monoxide initially contained in the exhaust gas reacts with oxygen during recombustion to become carbon dioxide, so it is hardly contained in the secondary exhaust gas.
  • FIG. 2 schematically shows a cross section when the furnace body 10 and the material storage chamber 21 are cut in the horizontal direction at the center position in the height direction of the material charging port 18.
  • the material charging door 23 is in the closed position.
  • a first exhaust duct 33 is connected to a position facing the material charging port 18 in the diameter direction of the furnace body 10.
  • a first exhaust damper 34 is provided inside the first exhaust duct 33.
  • a second exhaust duct 35 including a second exhaust damper 36 is connected to the upper part of the material storage chamber 21.
  • the exhaust dampers 34 and 36 are butterfly-shaped valve bodies, and the opening and closing thereof are controlled in synchronization with the material charging door 23 by a control means (not shown).
  • a heat exhaust passage 26 is provided at substantially the same height as the material storage chamber 21 in order to connect the upper portion of the side wall of the furnace body 10 and the side surface of the material storage chamber 21.
  • One end of the heat exhaust passage 26 opens into the furnace body 10 as an exhaust gas inlet 19.
  • the blower opening 12, the ignition burner 17, and the heat exhaust passage 26 are arranged close to each other.
  • the other end of the heat exhaust passage 26 opens into the material storage chamber 21 as an exhaust gas inlet 29.
  • the heat exhaust passage 26 is bypass-connected between the furnace body 10 and the material storage chamber 21.
  • the exhaust gas containing carbon monoxide generated by the combustion of the oxyfuel burner 16 passes between the charged metal materials and rises to the top of the furnace body 10.
  • the carbon monoxide contained in the exhaust gas that has reached the top of the furnace body 10 is ignited at the top of the furnace body 10 by the hollow flame f of the ignition burner 17, and oxygen contained in the air supplied from the blower port 12. It reacts with and completely burns to carbon dioxide.
  • the amount of oxygen required around the ignition burner 17 is continuously calculated by an external analysis means (not shown), and the blower port 12 is controlled by controlling the blown amount of the blower fan 32.
  • the amount of air supplied from is optimized. As a result of supplying an appropriate amount of air from the blower opening 12, almost no carbon monoxide and oxygen remain in the secondary exhaust gas.
  • a metal melting method using the metal melting furnace of this embodiment will be described below.
  • the first exhaust damper 34, the second exhaust damper 36, and the material charging door 23 are opened and closed in a synchronized state by a control means (not shown).
  • the opening amounts of the first exhaust damper 34 and the second exhaust damper 36 are adjusted so that the internal pressure of the furnace body 10 becomes a positive pressure (+ pressure) with respect to the outside air.
  • Step of supplying exhaust gas in furnace body 10 to metal material in material storage chamber 21 While the carried-in metal material is held in the material storage chamber 21, the control means maintains the material charging door 23 and the first exhaust damper 34 in a closed state, and the second exhaust damper is synchronized with this. 36 is kept open.
  • the high-temperature secondary exhaust gas continues to pass through the material storage chamber 21 via the heat discharge passage 26 and is discharged from the second exhaust duct 35.
  • the secondary exhaust gas warms the metal material stored in the material storage chamber 21.
  • High-temperature secondary exhaust gas contains almost no oxygen or carbon monoxide, so metal materials that are exposed to secondary exhaust gas during storage maintain good quality without material deterioration due to oxidation In this state, it is fully preheated.
  • Step of charging the metal material in the material storage chamber 21 into the furnace body 10 In the material charging process in which the metal material is charged into the furnace body 10 from the material storage chamber 21, the control means opens the material charging door 23 and synchronizes with this to open the first exhaust damper 34. The exhaust duct 33 is opened. At the same time, the control means closes the second exhaust duct 35 by closing the second exhaust damper 36. Thus, the material storage chamber 21 is closed against the outside air. The secondary exhaust gas is discharged from the upper part of the furnace body 10 via the first exhaust duct 33. That is, the exhaust gas is discharged without passing through the material storage chamber 21.
  • the opening amount of the first exhaust damper 34 is controlled so that the internal pressure of the furnace body 10 becomes a positive pressure with respect to the outside air. Thereby, the fluctuation of the pressure in the furnace when the material is charged is minimized, and the inflow of outside air is prevented at the same time. Moreover, since the metal material thrown into the melting chamber 13 is sufficiently preheated, it can be efficiently melted to obtain a molten metal.
  • the shape of the material storage chamber and the arrangement with respect to the furnace body described in the present embodiment can be appropriately changed.
  • the material storage chamber is disposed above the furnace body so that a part of the floor surface of the material storage chamber is adjacent to the upper portion of the furnace body, and the heat exhaust passage is provided as a passage rising from the furnace body to the material storage chamber. It is possible. By changing the positions of the exhaust gas inlet and the exhaust gas inlet so that the high-temperature secondary exhaust gas naturally rises from the furnace body to the heat exhaust passage, the metal material can be preheated more efficiently.
  • other burners such as an air burner can be applied to the ignition burner.
  • the present invention is applicable to a metal melting furnace for melting metal-based scrap and / or pig iron ingots.
  • Each disclosure of the cited patent documents and the like cited above is incorporated herein by reference.
  • the embodiments and examples can be changed and adjusted based on the basic technical concept.
  • Various disclosed elements including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.
  • Selection is possible. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.
  • any numerical value or small range included in the range should be construed as being specifically described even if there is no specific description.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
PCT/JP2013/051078 2012-03-16 2013-01-21 Four de fusion de métaux, et procédé de fusion de métaux Ceased WO2013136841A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-060016 2012-03-16
JP2012060016A JP2013194942A (ja) 2012-03-16 2012-03-16 金属溶解炉および金属溶解方法

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WO2013136841A1 true WO2013136841A1 (fr) 2013-09-19

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WO (1) WO2013136841A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5724025B1 (ja) * 2014-08-29 2015-05-27 アルカエンジニアリング株式会社 非鉄金属溶解炉
JP6284160B2 (ja) * 2015-02-26 2018-02-28 アルカエンジニアリング株式会社 非鉄金属溶解炉
KR102393081B1 (ko) * 2020-06-17 2022-05-03 재단법인 포항산업과학연구원 용융슬래그 주입장치
CN114739184B (zh) * 2022-03-22 2023-05-16 武钢集团昆明钢铁股份有限公司 一种高炉煤气燃烧蓄热稳定装置

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JPS5136503U (fr) * 1974-09-12 1976-03-18
JPS5835799U (ja) * 1981-09-03 1983-03-08 有限会社日本特殊技術研究所 材料予熱室と燃焼室とに接続して溶解をよくする誘導炉
JPS5855679A (ja) * 1981-09-29 1983-04-02 マツダ株式会社 溶解炉
JPH05271811A (ja) * 1992-03-30 1993-10-19 Nippon Sanso Kk 金属の熔融方法
JPH0755341A (ja) * 1993-08-06 1995-03-03 Taiyo Chuki Co Ltd 気体燃料を使用するシャフト型溶解炉
JPH1121607A (ja) * 1997-07-07 1999-01-26 Nkk Corp アーク炉操業方法
JPH11325746A (ja) * 1998-05-20 1999-11-26 Osaka Gas Co Ltd 非鉄金属溶解炉
JP2002022366A (ja) * 2000-07-06 2002-01-23 Nkk Corp 冷鉄源の溶解方法

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JPH10300365A (ja) * 1997-04-18 1998-11-13 Daido Steel Co Ltd スクラップ予熱装置
JP2002156186A (ja) * 2000-02-14 2002-05-31 Nkk Corp 溶解設備およびそれを用いた処理方法
JP2010230237A (ja) * 2009-03-27 2010-10-14 Aisin Takaoka Ltd 金属溶解炉および金属溶解方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5136503U (fr) * 1974-09-12 1976-03-18
JPS5835799U (ja) * 1981-09-03 1983-03-08 有限会社日本特殊技術研究所 材料予熱室と燃焼室とに接続して溶解をよくする誘導炉
JPS5855679A (ja) * 1981-09-29 1983-04-02 マツダ株式会社 溶解炉
JPH05271811A (ja) * 1992-03-30 1993-10-19 Nippon Sanso Kk 金属の熔融方法
JPH0755341A (ja) * 1993-08-06 1995-03-03 Taiyo Chuki Co Ltd 気体燃料を使用するシャフト型溶解炉
JPH1121607A (ja) * 1997-07-07 1999-01-26 Nkk Corp アーク炉操業方法
JPH11325746A (ja) * 1998-05-20 1999-11-26 Osaka Gas Co Ltd 非鉄金属溶解炉
JP2002022366A (ja) * 2000-07-06 2002-01-23 Nkk Corp 冷鉄源の溶解方法

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